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Architecture and Neurocytology of Monkey Cingulate Gyrus

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Architecture and Neurocytology of Monkey Cingulate Gyrus THE JOURNAL OF COMPARATIVE NEUROLOGY 485:218–239 (2005) Architecture and Neurocytology of Monkey Cingulate Gyrus BRENT A. VOGT,1,2* LESLIE VOGT,1,2 NURI B. FARBER,3 AND GEORGE BUSH4,5 1Cingulum NeuroSciences Institute, Manlius, New York 13104 2State University of New York Upstate Medical University, Syracuse, New York 13210 3Department of Psychiatry, Washington University, St. Louis, Missouri 63110 4Department of Psychiatry, Harvard Medical School, Boston, Massachusetts 02115 5Massachusetts General Hospital, Charlestown, Massachusetts 02129 ABSTRACT Human functional imaging and neurocytology have produced important revisions to the organization of the cingulate gyrus and demonstrate four structure/function regions: ante- rior, midcingulate (MCC), posterior (PCC), and retrosplenial. This study evaluates the brain of a rhesus and 11 cynomolgus monkeys with Nissl staining and immunohistochemistry for neuron-specific nuclear binding protein, intermediate neurofilament proteins, and parvalbu- min. The MCC region was identified along with its two subdivisions (a24Ј and p24Ј). The transition between areas 24 and 23 does not involve a simple increase in the number of neurons in layer IV but includes an increase in neuron density in layer Va of p24Ј,a dysgranular layer IV in area 23d, granular area 23, with a neuron-dense layer Va and area 31. Each area on the dorsal bank of the cingulate gyrus has an extension around the fundus of the cingulate sulcus (f 24c, f 24cЈ, f 24d, f 23c), whereas most cortex on the dorsal bank is composed of frontal motor areas. The PCC is composed of a dysgranular area 23d, area 23c in the caudal cingulate sulcus, a dorsal cingulate gyral area 23a/b, and a ventral area 23a/b. Finally, a dysgranular transition zone includes both area 23d and retrosplenial area 30. The distribution of areas was plotted onto flat maps to show the extent of each and their relationships to the vertical plane at the anterior commissure, corpus callosum, and cingulate sulcus. This major revision of the architectural organization of monkey cingulate cortex provides a new context for connection studies and for devising models of neuron diseases. J. Comp. Neurol. 485:218–239, 2005. © 2005 Wiley-Liss, Inc. Indexing terms: cingulate cortex; neurofilament proteins; cingulate motor areas; midcingulate cortex; retrosplenial cortex; pyramidal neurons The primate cingulate gyrus was early considered to be perigenual anterior cingulate cortex (ACC), midcingulate a uniform structure with a role in limbic function (Broca, cortex (MCC), posterior cingulate cortex (PCC), and retro- 1878; Papez, 1937; MacLean, 1990). Although it has also splenial cortex (RSC). been recognized to have a dual structure with different A key aspect of the four-region model is division of connections (Baleydier and Mauguiere, 1980; Vogt et al., Brodmann’s (1909) ACC into a perigenual and midcingu- 1987) and with an executive function in the anterior and late regions and this differentiation is pivotal to under- evaluative role for the posterior parts (Vogt et al., 1992), many cytoarchitectural studies showed the human cingu- late gyrus to be more complex than the dual model sug- Grant sponsor: National Institutes of Health; Grant number: NINDS gests (Smith, 1907; Brodmann, 1909; Vogt and Vogt, 1919; RO144222; Grant number: NIAAA AA06916 (to B.A.V.); Grant number: von Economo and Koskinas, 1925; Rose, 1927) and numer- NIA PPG11355 (to N.B.F., B.A.V.); Grant sponsor: National Science Foun- ous human functional imaging studies show that cingu- dation; Grant number: 242229 (to G.B). late cortex is involved in more than just two essential *Correspondence to: Brent A. Vogt, Cingulum NeuroSciences Institute, 4435 Stephanie Drive, Manlius, NY 13104. E-mail: [email protected] functions. Structure/function correlations with human Received 12 October 2004; Revised 13 December 2004; Accepted 13 neurocytology and imaging, electrical stimulation, and December 2004 stroke findings suggest there are four rather than just two DOI 10.1002/cne.20512 regions (Vogt et al., 1997, 2004). The four regions are Published online in Wiley InterScience (www.interscience.wiley.com). © 2005 WILEY-LISS, INC. MONKEY CINGULATE GYRUS 219 standing the functional organization of primate cingulate large neurons in layers III and V that appears to parallel cortex. The ACC has reciprocal connections with the Braak’s primitive gigantopyramidal field, and they iden- amygdala, projections to the nucleus of the solitary tract tified a rostral extension termed cmc2 with smaller, al- and dorsal motor nucleus of the vagus, regulates auto- though still large, neurons. This latter area might regu- nomic output, and stores emotional memories (Neafsey et late muscles in the hindlimb, lower trunk, and tail al., 1993; Vogt et al., 1997, 2003, 2004). In contrast, the (Rizzolatti et al., 1996) and may have the highest density MCC regulates skeletomotor function through its projec- of cingulospinal projection neurons (Dum and Strick, tions to the spinal cord, receives only modest amygdala 1991), whereas cmc1 may regulate forelimb, upper trunk, input to its anterior part and does not directly regulate and neck muscles (Rizzolatti et al., 1996). The cmc dichot- autonomic outputs, and has a prominent projection from omy has not been considered in the monkey nor have posterior parietal cortex (Vogt et al., 1997, 2004). The transitions from cingulate to premotor areas in the cingu- posterior part of human MCC contains the primitive gi- late sulcus dorsal bank. gantopyramidal motor field of Braak (1976), which in Second, a previous map of monkey cingulate cortex monkey is termed area 24d or the caudal cingulate motor shows a simple transition from agranular area 24 to gran- area (cCMA). The cCMA has somatotopically organized ular area 23; presumably due to a buildup in layer IV skeletomotor projections to the spinal cord (Biber et al., neurons similar to that shown by Brodmann (Vogt et al., 1978; Dum and Strick, 1991, 1993, Matelli et al., 1991; 1987; Morecraft et al., 2004). Recent human studies show Luppino et al., 1991) and large pyramids in layer V that a more complicated transition pattern, including differen- express intermediate neurofilament proteins (Nimchinsky tiation of layer Va in midcingulate cortex (Vogt et al., et al., 1996, 1997) and neurons that project to motor cortex 1995, 2003, 2004), which includes a neuron-dense layer Va (Morecraft and Van Hoesen, 1992; Nimchinsky et al., in pMCC, a dysgranular division of area 23 (area 23d), and 1996). The rostral cingulate sulcus has the rostral cingu- a dorsal posterior cingulate cortex (d23a/b) with granular late motor area (rCMA), which differs from the cCMA layers IV and Va. This sequence of transitional events because the former has longer premovement activity on- needs to be evaluated in the monkey. It is also unclear set, responses associated with the changing reward fea- whether area 32 extends dorsal to the rostral CMA as it tures of a movement, and projections to the presupple- does in human. Thus, a complete analysis of MCC as a mentary motor part of the striatum rather than to that functional and cytological entity and its adjacent areas is part which receives primary motor cortex input and dif- needed in the monkey. ferences in corticocortical connections (Shima et al., 1991; Third, the monkey PCC has been differentiated into two Luppino et al., 1991; Van Hoesen et al., 1993; Rizzolatti et parts on the basis of thalamic (Shibata and Yukie, 2003), al., 1996; Shima and Tanji, 1998; Takada et al., 2001; prefrontal (Vogt and Barbas, 1988), and superior temporal Akkal et al., 2002). Finally, the duality of the human MCC (Yukie, 1995) connections. These two divisions also have has been established with anterior (aMCC) and posterior been immunohistochemically and functionally defined in (pMCC) parts based on the two CMAs and different cyto- human (Vogt et al., personal communication). It is not architectures (Vogt et al., 2003). known to what extent the monkey PCC has dorsal (dPCC Progress over the past decade in human neuroscience or area d23a/b) and ventral vPCC or area v23a/b) divi- has raised many questions about the organization of the Ј Ј primate cingulate gyrus, particularly in the monkey, and sions. Where is the junction between areas p24a /b and these questions frame the present research. First, Zilles et area 23a/b and between areas 24d and 23c in the caudal al. (1996) showed a caudal area cmc1 in human with very cingulate sulcus? Also, what are the characteristics of the border between pMCC and PCC, and is there a cytological basis for dorsal and ventral area 23a/b? Fourth, from a methodological perspective, it should be noted that cytoarchitectural studies often use low magni- Abbreviations fication optics to assess Nissl preparations and often focus ac anterior commissure on only a part of the gyrus. Cellular resolution using ACC anterior cingulate cortex neuron-specific nuclear binding protein (NeuN) has the cas callosal sulcus benefit of not staining glial or vascular cells and enhances ces central sulcus cgs cingulate sulcus laminar differences not apparent with Nissl stains. Immu- cml caudomedial lobule; mainly area v23b nohistochemistry can be used to assess particular proteins rCMA, cCMA cingulate motor areas, rostral or caudal expressed by specific neurons as with antibodies to inter- gcc genu of the corpus callosum mediate nonphosphorylated neurofilament proteins (NFP; ir immunoreactivity MCC midcingulate cortex SMI32 antibody) for large pyramidal neurons
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